Machine for manufacturing dynamo armatures



Dec. 15, 1942. L. E. POOLE ETAL 2,305,273

MACHINE FOR MANUFACTURING DYNAMO ARMATURES Filed Jan. 6, 1940 13 Sheets-Sheet l u 365 r 363 V I c- 364 BY 32:; Z

Dec. 15, 1942. POOLE ETAL 2,305,273

MACHINE FOR MANUFACTURING DYNAMO ARMATURES Filed'Jan. 6, 1940 13 Sheets-Sheet 2 Dec. 15, 1942. I. E. POOLE HAL 2,305,273

MACHINE FOR MANUFACTURING DYNAMO ARMATURES Filed Jan. e, 1946 13 Sheets-Sheet s -BY 44 ATTORNEY Dec. 15, 1942. POOLE fi- 2,305,273

I v MACHINE FOR MANUFACTURING DYNAMO ARMA'I'URES Filed Jan. 6, 1940 13 Sheets-Sheet 4 szi Dec. 15, 1942. E. POOLE ET AL 2,305,273

' MACHINE FOR MANUFACTURING DYNAMO ARMATURES Filed Jan. 6, 1940 13 Sheets-Sheet 6 \WI/ 4 m yg 9 A 353 W M 1% i ATTORNEY Dec. 15, 1942. E. POOLE arm.

MACHINE FOR MANUFACTURING DYNAMO ARMA'IURES Filed Jah. 6, 1940 15 Sheets-Sheet 7 INVENTORa.

\N i as 3 I II Dec. 15, .1942. E. POOLE ETAL 2,305,273

MACHINE FOR MANUFACTURING DYNAMO ARMATURES I Q Filed Jan. 6, 1940 13 Sheets-Sheet e 1 i x: x

L a INV NTORfl ATTORNEY Dec. 15, 1942. L. E. POOLE ET AL 2,305,273

MACHINE FOR MANUFACTURING DYNAMO AHMATURES Filed Jan. 6, 1940 13 Sheets-Sheet 9 Dec. 15, 1942. 1.. E. POOLE ETAL MACHINE FOR MANUFACTURING DYNAMO ARMATURES Filed Jan. 6, 1940 1:5 Sheets-Sheet 1o QM \R n 3 Dec. 15, 1942. L. E. POOLE ETAL 2,305,273

momma FOR MANUFACTURING DYNAMO ARMATURES Filed Jan. 6, 1940 1s Sheets-Sheet 11 INVENTOR Dec. 15, 1942. L. E. POOLE ET AL MACHINE FOR MANUFACTURING DYNAMO ARMATURE ES Filed Jan. 6, 1940 13 Sheets-Sheet 12 Dec. 15, .1942. 1.. E. POOLE ET AL 2.305.273

MACHINE FOR MANUFACTURING DYNAMO ARMATURES Filed Jan. 6, 1940 13 Sheets-Sheet 13 R W w m or m w c m w b v T 0, v m M B 0/v.V/,/)V/.'7//\ v m 2 L Y B H U M M/ 5 Q 2 Z vow/v Mun I INDEX 0 PAWL 103 CRANK U922 M FEED Roms BLADE BLADE CLAMP 511 ,PAPEP. Fszu F J yP Patented Dec. 15, 1 942 MACHINE FOR MANUFACTURING DYNAMO ARMATURES Lora E. Poole and Ernest R. Fausset, Anderson, Ind., assignors to General Motors Corporation, Detroit, Mich., a corporation of Delaware Application January 6, 1940, Serial No. 312,796

4 Claims.

This invention relates to the manufacture of armatures for dynamo electric machines and more particularly to that step in the manufacture of armatures which follows the step of assembling windings with a slotted armature core. It has been the practice to force into the slots of the cor and upon the windings therein strips of insulating material for the purpose of confining the windings Within the slots against the action of centrifugal force. Such strips of insulating material have been cut from sheet insulating material, or from rope of twisted fiber or paper. In the case of sheet insulating material it has been the practice to use a machine which cuts the strips and applies them to the slots of the armature core. When fiber or paper rope is used this material is supplied on reels and is fed by the machine to a position radially opposite an armature slot. The machine includes a mechanism for cutting off the desired length of rope and inserting it between the core teeth.

The present invention contemplates the use of folded strips of insulating material such as paper which is relatively tough and somewhat resilient. This paper is folded in such manner as to provide a body which is oblong in cross-section so that it can be passed in the direction of its longer cross-sectional dimension between adjacent core teeth defining the throat of a winding slot. The strip is so folded that, after having passed the throat of the slot, it is permitted to expand and fill up that portion of the slot immediately inside of the throat and thus take a shape by increasing its bulk which enables it to resist centrifugal force acting upon the strip and the windings. In the copending application of Lora Poole S. N. 173,812, filed November 10, 1937, patented June 25, 1940, Patent No. 2,205,- 822, there is disclosed a method of folding a strip of insulating paper in this manner and of assembling the length of such folded material with a wound armature.

It is the aim and object of the present invention to provide in a single machine means for folding a strip of paper unwound from a supply roll, in the manner disclosed in said Poole application, and for feeding the folded material to a location adjacent the core slot, the paper being located with its longer cross-sectional dimension extending radially of the armature core, means for compressing the strip'in the direction of its shorter cross sectional dimension, and means for severing a required length of folded material from the remaining portion of folded material being supplied by the use of a shear blade moving radially of the armature while the strip is being compressed, and means for inserting the strip into the slot, and means for indexing the core into various strip-assembling positions.

The present invention contemplates the application of insulating strips into an armature which has had its core slots lined with insulating material previous to the application of windings thereto. This insulating material may be in the form of a continuous strip which not only lines the slots but also covers the periphery of the core teeth.

It is a further object of the present invention to provide the machine, which folds the insulating material and inserts it into the slots, with additional means for partially severing the slot lining insulation at the edges of the core teeth so that, after the armature has been operated upon by the machine, the strips of insulation overlying the periphery of the core teeth may be quickly removed by passing the armature between rotating wire brushes.

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawings wherein a preferred embodiment of the present invention is clearly shown.

In the drawings:

Fig. 1 is a perspective view showing the front and lefthand side of a machine embodying the present invention.

Fig. 2 is a fragmentary perspective view of the front of the machine on a larger scale than Fig. 1,

Fig. 3 is a perspective view looking approximately in the direction of the arrow 3 of Fig. 1 and showing principally the mechanism for folding the insulating material which provides the insulating strips for the armature core slots.

Fig. 4 is a fragmentary plan view.

Fig. 5 is an end view on the line 5-5 of Fig. 4.

Fig. 6 is a sectional view on the line 6-6 of Fig. 4.

Fig. 7 is a sectional view on the line 1--1 of Fig. 4.

Fig. 8 is a sectional view on the line 8-8 of Fig. 4.

Fig. 9 is a sectional View on the line 99 of Fi 4.

Figs. 10, 11, 12, 13, 14, 15 and 16 are sectional views of the insulating material at various stages of formation starting with the flat stage at Fig. 10 and ending with the folded stage in Fig. 16.

Fig. 17 is a sectional view on the line I1--|'I of Fig. 5.

Fig. 18 is a fragmentary end elevation looking generally in the direction of arrow I8 of Fig. 3 and includes sectional views on the lines I8-I8 of Figs. 4 and 22. Fig. 18 shows the strip inserting blade fully advanced into an armature slot, and it shows the clutch control mechanism in the position just before the machine comes into home position.

Fig. 19 is a fragmentary view similar to Fig. 18 showing certain operating parts in the normal or home position.

Fig. 20 is a fragmentary sectional view on the line 2020 and on line 20a 20a of Fig. 19 showing certain parts in home position.

Fig. 21 is a view similar to Fig. 20 but showing a side view of a portion of the clutch control mechanism.

Fig. 22 is a sectional view on line 2222 of Fig.18.

Fig. 23 which is on the same sheet with Fig.

18, is a sectional view on the line 2323 of Fig. 24.

Fig. 24 is a sectional View on the line 2424 of Fig. 22.

Figs. 25 and 26 are enlarged scale sectional views of the armature assembly and certain parts of the machine in different positions of operation.

Fig.. 27 is a diagram of movements of certain parts of the machine.

General construction and power drive Referring now to Fig. 1 which shows a general perspective view of the machine, 30 designates a machine base or table supported by legs 3| and 32 tied together by cross bar 33 with support plates 34 and 3-5 between which there are supported two paper supply reels 36 and 3'! mounted on pivot rods 38 and 36, respectively.

The base 30 is provided with a wide groove or recess at 40 located between two side flanges M and 42. The recess 40 receives pedestal frames 43 and 44 which together cooperate to provide a cylindrical chamber for receiving and supporting an armature indicated at A in Figs. 21 and 24. The pedestals 43 and 44 support a mechanism, to be described later, for severing lengths of folded insulation material and for inserting such lengths into the core slots of an armature, said armature being indexed or intermittently rotated to bring its slots successively into strip receiving position. The pedestals 43 and 44 support a platform 46 which provides a tie for the upper ends of the pedestals. Platform 46 supports an electric motor 50 which provides the sole source of power for the machine. Upon the shaft of motor 50 is mounted a small gear, not shown, which meshes with a gear 5I which is mounted upon a crank shaft 52 and which is connected with said shaft by means of a clutch designated in its entirety by C, details of which will be described later.

Referring to Fig. 22, the shaft 52 is journalled in bearings 53 and 54 provided by the pedestal 43. Shaft 52 is provided with gear portions 55 and 56 joined by crank arm portion 57. The platform 46 provides bearing brackets 60 which cooperate with bearing caps 6I to support bearings 62 for an idler shaft 63 carrying gears 65 and 66 which mesh respectively with gears 55 and 56 of the shaft 52. Pedestal 44 provides bearings I3 and I4 for a crank shaft I2 providing gears I5 and I6 which mesh respectively with gears 65 and 66 which are joined by a crank arm 11. It will be described later that the crank arms 51 and TI operate the mechanism for shearing a predetermined length of folded insulating material from the supply strip of the same and inserting the lengths successively into the armature core slots, and the mechanism for partly shearing away the peripheral insulation of the core.

Shaft 12 carries a sprocket gear connected by a chain 8| with a similar sprocket gear 82 fixed to a shaft 83. Chain 8! passes partly around an idler sprocket gear 84 mounted on a stub shaft 85 carried by a bracket 86 attached to the pedestal 44. Shaft 83 is journaled in a bearing bracket 81 attached to the pedestal 44 and in bearing brackets 08 and 89 provided by base 30.

Armature indexing mechanism Referring to Figs. 5, 8 and 17, to shaft 83 there are keyed a main eccentric member 90 and eccentric cap member 9| providing a groove 92 eccentric to shaft 83. The groove 92 receives an eccentric strap 93 connected with an adjustable link or turnbuckle 94 having screw threads at its opposite ends of opposite pitch, as'shown in Figs. 8 and 17. Adjustable link 94 is connected with a pivot block 95 which is attached by pivot pin 96 to a slide 91 guided by ways 98 and 99 and way cover plates I00 and IN respectively. The slide 9'! carries a pivot pin I02 which supports a pawl I03 urged by a spring I04 into engagement with a ratchet I05. Ratchet I05 is provided with a tubular shaft I66 (Fig. 9) journalled in a bearing I01 provided by a bearing bracket I08 supported by table 30. Shaft I06 is provided at its righthand end (Fig. 9) with a tapered counterbore I69 which cooperates with resilient arms IIO of a tri-furcated collet chuck sleeve I II, which is screwthreadedly attached to a sleeve I I2 slidably associated with the tubular shaft I06. The sleeve H2 is urged toward the left by a heavy spring II3 located between the left end of shaft I06 and the head II4 of the sleeve H2. The function of the spring II3 is yieldably to urge the tri-furcated collet chuck element II I against the right hand tapered counterbored end of the shaft I06 thereby causing the resilient elements N0 of said collet chuck member III to seize the shaft S of the armature assembly A shown in Fig. 24. The shaft H2 is screwthreadedly associated with a stop rod II5 engaged by an arm II! of a bell crank lever II8 pivoted at II9 upon a bracket I20 suspended from the'table 30 (Fig. 9). Lever IIB has an arm I2I which terminates in spaced ears I22 (Fig. 1) across which is located a pin I 23 connected by a rod I 24 with a pedal lever I25 pivoted upon a pin I26 carried by a bracket I2! suspended by bolts I28 from the cross bar 33, and spaced from the cross bar 33 by tubes I29 which surround the bolts I28. Pedal I25 includes a foot pad I30 by which the operator presses the lever I25 downwardly to effect clockwise rotation of the bell crank II 8 and movement of the rod II5 toward the right to push the armature shaft loose from the collet chuck while at the same time relieving the seizing pressure of the collet chuck upon said shaft S. The righthand end of rod H5 provides a limiting stop for the shaft S. Rod H5 is adjustably secured to the sleeve II2 through its screw-thread connection and is locked in the desired position of longitudinal adjustment by a lock nut II5a. Since the rod II 5 is adjustable. the machine may be readily adapted to accommodate armature assemblies having shafts S of varying lengths relative to the end laminations of the armature coil.

It will be understood that an armature assembly A is supported not only by the collet chuck shown in Fig. 9, but by the walls of the pedestals 43 and M which, as shown in Fig. 1, define the armature receiving recess 45.

Returning now to the further description of the indexing mechanism, it will be understood that rotation of the shaft 83 effects operation of the eccentric 90 to oscillate the strap 93 and reciprocation of the slide 91 and of the awl I03 to effect intermittent rotation of the shaft I06. The mechanism for preventing the backing up of the ratchet I05 and for securing the proper location thereof after an intermittent movement of the shaft I06 will now be described particularly with reference to Fig. 8.

The bracket I08 carries a pivot stud I3Ia supporting a ratchet locking dog I3I having a tooth I3Ib which fits in accurately between the spaces of the teeth I05a of ratchet I05. Dog I3I is urged into this locking position by a plunger I34 urged by spring I35, said. plunger and spring being located within a guide block I36 attached by screws I31 to the bracket I08. The tooth l3Ib of the locking dog I3I is so shaped that it cannot be cammed out from the space between adjacent teeth I05, but must be positively retracted. Movement of the slide 91 is used positively to effect retraction of the dog tooth I3Ib from the ratchet I05. For this purpose the slide 91 is provided with an extension I38 having a notch defined by two side surfaces E3812 and I385. As shown in Fig. 8, the side surface I385 is engaged by a pin I32a carried by a cam I32 pivotally mounted at I33 upon the bracket I08. As the slide 91 and the extension I38 are moved to the right from the position shown in Fig. 8 the pin I32a is caught by the surface IBM and is caused to move toward the right, thereby causing the cam I32 to rotate counterclockwise and to cause its lobe I32b to engage a pin I3Id on the dog I3I to move it toward the right thereby causing dog tooth I3Ib to be withdrawn from a tooth space I055 between teeth I05a. The point of the tooth I3Ib is retracted at least so far toward the left that it may be engaged by a beveled surface I050 of the immediately adjacent tooth I05a. At that time the pin I3Id of dog I3! will ride upon the high part of the lobe I325 and will hold the dog I3I in the retracted position, so that intermittent movement of the ratchet I05 may take place when the slide 91 is moved from right toward left into the position shown. As the slide 91 approaches the position shown in Fig. 8 to complete an increment of rotation of the shaft I06, the notch surface I385 of the extension I38 will engage the pin I32a to cause the cam I32 to rotate clockwise and thereby remove the lobe I321) from engagement with the pin I3Id so that the dog I3I may be restored to ratchet locating position. The dog I3I is restored to ratchet locating position not only by the spring actuated plunger I34, but also as the result of engagement of the pin I3Id with a shoulder I380 provided by the slide extension 530. In this way the collet chuck locking dog I3I is positively retracted from engagement with the ratchet I05 in order that in termittent rotation of the ratchet may be effected by the pawl I03; and the dog I3I is positively restored to shaft locking position after the increment of rotary movement of the chuck has been effected.

Paper folding and feeding mechanism Referring to Figs. 4, 5 and 17, shaft 83 drives a crank disc I40 having a cross T-slot I M which receives an adjustable screw I42 having a T-head which is slidable through the slot MI and is secured in the desired position by nut I43. The screw I42 provides a pivotal connection for a connecting rod I44 pivotally attached at I45 to a cup-shaped pawl carrier I the hub of which carries a press-fitted bearing I5I (Fig. 17) which is journalled on the hub I53 of a bevel gear I52 and also upon a collar I54, pinned at I54a (Fig. 4) upon a shaft I56. Pawl carrier I50 is threadedly engaged by screws I51 which provide pivots for three pawls I58 (Fig. 5) engageable with a ratchet I59 which is connected by pins I60 with the gear I52. Springs I6I yieldingly urge the pawls I58 against the ratchet I59. The pawl I58 may be lifted away from the ratchet I59 by lifter pins I62 carried by a lifter pin ring I63 journalled upon the hub I53 of the pawl carrier I50. A nut I55 threadedly engaging the collar I54 retains the pawl lifter pin carrier I63 and the pawl carrier I50 in position between the nut I55 and the ratchet I59. When it is desired to retract the pawls I58 from the ratchet I59, the operator turns the ring I63 clockwise as viewed in Fig. 5, thereby causing the pins I62 to cam the pawls I58 away from the ratchet I59. A detent ball I64, urged by a spring I65, yieldingly retains the ring I63 either in its pawl lifting position or in its non-pawl lifting position. When this adjustment has been made, then the shaft I56 may be turned manually by app-lying to its squared end I56a a suitable wrench or crank, not shown.

The shaft I56 is journalled in bearings provided by the brackets 88 and. 89; and it is driven by the bevel gear I52 and it drives another bevel gear I90. Referring to Figs. 5, 9 and 1'7, the gear I52 drives a gear I1I which is mounted upon and. drives a shaft I12 journalled in two plates I13 and I14 which extend vertically from a sub-base plate I16 resting upon the main base 30. Shaft I12 carries a forming roller I and a gear I8I which meshes with a gear I82 which drives a forming roller I83 keyed to a shaft I84. As shown best in Fig. 3, shaft I84 is rotatably supported by bearing blocks I05 slidable in ways I86 which are provided by the two plates I13 and I14. The blocks I are urged downwardly by spring I81s confined by plates I88 which are connected by screws I89 with the plates I13 and I14. The springs I81 yieldingly urge roller I83 toward the roller IBI in order that these rollers may grip strips of paper fed between them whereby the strips are propelled between rollers and are formed, while thus longitudinally moving into a certain shape incident to the complete formation or folding of the paper, as will be described later.

Referring to Figs. 7 and 17 the beveled gear I90 drives a smaller bevel gear I9I which drives a shaft I92 journalled in bearings provided by the two plates I13 and I14 and driving a forming roller I93 and a gear I94. Gear I94 drives a gear I95 which drives a forming roller I96 mounted on a shaft I91. Shaft I91 is journalled in bearing blocks I98 guided by ways I99 provided by the plates I13 and I14 (see also Fig. 3). The blocks I98 are urged downwardly by springs 200 confined by plates 20I attached to plates I13 and I14 by screws 202. The springs 200 yieldingly urge the roller I96 against the roller I93 in order to grip the paper and form it in accordance with one of the steps necessary to the formation of paper preparatory to its use as a staking member for assembly with a slotted armature core.

At a certain point in the cycle or operation of the machine to insert strips of folded papers in all of the slots of an armature core and also to partially break away the core insulation which envelops thecore teeth, it is necessary to dis continue the feeding of paper to the mechanism which inserts paper strips in the armature core slots. To accomplish this, the feeding mechanism is momentarily disabled through the use of means which elevates the rollers I83 and I96 out of contact with the paper which passes between them and the rollers I86 and I93. This roller elevating mechanism will now be described.

Referring to Figs. 4, 6 and 17, the shaft 83 provides a worm 2I6 located between its shaft sections 83a and 83b. Worm 2I9 drives a worm wheel 2 attached to a shaft 2I2 journalled in brackets 2I3 and 2I4 (Fig. 6). Shaft 2I2 carries cams 2I5 and 2I6 spaced by tube 2I1 which passes through the plates I13 and I14. Cams 2I5 and 2I6 cooperate with vertically movable slides 2I1 guided by plates H8 and engageable with stop screws 2I9 carried at the ends 229 of arms 22I pivoted upon pins 223 attached respectively to plates I14 and I13. Levers 221 are each provided with a roller or other wear piece 226 engageable with the under side of a bearing block I85. Obviously, upward movement of slides 2" will cause the levers 22I to move upwardly and thus elevate the blocks I85 and the shaft I84 and thus lift the forming roller I83 away from the paper and the forming roller I89.

By exactly similar means and in a similar manner, the slides 2I1 operate to elevate the bearing blocks I98, the shaft I91 and the forming roller I96 away from the forming roller I93. The parts which accomplish this have been given reference numerals similar to those which effect the elevation of the roller I83 but with the afiix a.

The timing of the cams 2I5 and 2I6 with re-.

spect to other operating elements of the machine will be described fully later. For the present, it will sufi'ice to state that the shaft 2I2 rotates once during each cycle of operation of the machine. Therefore once during each cycle of machine operation the cams 2I5 and H6 function to lift the forming rollers I83 and I96 out of engagement with the paper so that no feeding of paper takes place, although the rollers I89 and I93 may be rotating at that time.

Referring now to Figs. 10 to 16, inclusive, the paper P may be two ply as shown in these figures or single ply as shown in Fig. 9. The paper P is originally flat as it enters into engagement with a guide roller 239 pivotally supported by a bracket 232 attached to a cross plate 233 fixed to the side plates I13 and I14. The cross plate 233 supported a bracket 234 upon which are mounted forming plates 235 and 236 which change the piece of paper P from flat, as shown in Fig. 10, to inverted U-shape, as shown in Fig. 11. Then the paper. passes between the forming rollers I80 and I83 which change its shape into the inverted channel shape as shown in Fig. 12. Then the paper passes between forming plates 240 and 2M which gradually change the shape of the paper from that shown in Fig. 12 to that shown in Fig. 14. An intermediate step is indicated by Fig. 13. The plates 246 and 24I are supported by a bracket 242 supported between the side plates I13 and I14. The paper then passes between the rollers I93 and I96 where 75 it is formed into the shape shown in Fig. 15. As the paper passes from the plates 240 and 24I to the rollers I93 and I96, it is maintained in the condition shown in Fig. 14 by passing it between rollers 243 and 244. Rollers 244 is pivotally supported by a bracket 245 attached to the bracket 242. Bracket 245 is provided at the forward or righthand end with such shape as to start the paper into the condition in which it finally r H arrives as shown in Fig. 15. The roller 243 is pivotally supported by the bifurcated end of a lever 241 pivoted at 248 upon a bracket 249 carried by a plate 2. Lever 241 is urged clockwise by a spring 259 the compression of which is eifected by an adjusting screw 25I screwthreadedly connected with the lever 241 and secured in the desired position of adjustment by a lock nut 252. After the paper has been formed, as shown in Fig. 15, it is formed into the shape shown in Fig. 16 by causing it to pass into the flared entrance of a tube 268 of oblong cross section and comprising sections 260a and 26%. This tube 260 is supported by brackets 26I upon a plate 262 secured by screws 263 to a cross plate 264 which is tied in between the righthand ends of the plates I13 and I14. The righthand end of the plate 262 is attached by screws 265 to the bracket I88 which supports the collet chuck for rotating the armature assembly. From the tube 268 the folded insulating material passes to the apparatus for severing it from the supply and inserting it into armature core slots.

Strip severing and inserting mechanism Referring to Fig. 24, the crank 51 is associated with a connecting rod comprising caps 210 and 21I secured by screws 212 and a turn-buckle 213 connected with a pivot block 214 journalled on a cross-pin 215 carried by a slide 216. Block 214 slides on ways 211 provided by the pedestal bracket 43. Sleeve 45 is provided with a slot which receives a blade 218 secured to the block 214 by screws 219 and a bar 219a. Similarly, the crank 11 is associated with a connecting rod comprising caps 280 and 28I fixed by screws 282 and a turnbuckle 283 connected with a pivot lock 284 journalled on cross pin 285 carried by a slide block 286 slidable in ways 281 provided by the pedestal 42. Sleeve 45 is provided with a slot for receiving a blade 288 secured to the slide 286 by screws 289 and a bar 289a. The cranks 51 and 11 are geared together so that the blades 218 and 288 are reciprocated concurrently into and out of the slots of the armature core A. The function of blade 218 is to sever lengths of strip material and force it into core slots. The function of blade 288 is to partly sever or break away the slot insulation S which surrounds the armature core teeth, so that, the portions of insulation located adjacent the core teeth peripheries may easily be removed by contact with a rotating wire brush.

Pedestal 44 is provided with an opening 299 for receiving a bushing or sleeve 29I attached to the pedestal 44 by screws 292. Bushing 29I guides a plunger 293 carrying a blade 294 extending through a slot in the sleeve 45. The plunger 293ji's actuated toward the core by a lever 294 mounted on a shaft 295 and operated by a hand lever 296 against the action of a spring 291 which urges the plunger 293 against the arm 294. Blade 294 is received by a core slot to provide an initial location of the armature core before the armature shaft S is gripped by the collet, chuck III.

The pedestal 43 is provided with a side opening 300 which receives a bushing 30| secured by screws 302. Bushing 301 receives a screw 303 threadedly engaging a tapped hole 304 in the insert sleeve 45.

Referring to Fig. 18, the sleeve 45 is provided with a shear bar or stationary blade 3H) which cooperates with the left hand edge of the blade 218 (see Fig. 1) to cut an insulating strip of folded paper from the supply strip P which is delivered by the guide 260 to the slot which receives the blade 218. As the blade 218 moves downwardly, it severs an insulation strip along the right hand edge of the shear bar 310 (see Fig. 21) and causes the severed strip to be inserted in an armature core slot in the manner shown in Figs. 25 and 26. Then the armature core A is indexed clockwise to bring a slot which has just received a strip into alignment with the blade 288 which is then elevated. A subsequent downward movement of the blade 288 causes the strip to be compressed against the windings in the slot and causes the peripheral core tooth insulation to be partially broken away as shown in Fig. 26.

It will be observed that the strip P is severed by movement of the blade 218 in a direction radially of the slot and coincidental with the longer cross sectional dimension of the strip. In

order to sever the strip P in this manner without'permitting it to buckle, means have been provided for compressing the strip just above the blade Bill. The strip is compressed against a portion of the sleeve 45 by a finger 3 provided on the end of a lever 3|2, pivoted at 313 on a bracket 3l4 having an extension 3|5 provided with a lug 3H5. Lug 315 has a recess 3!! for receiving a spring 318 seating in a recess 3!!! provided by the lever 3l2. Lever 3l2 has a cam follower surface 320 engaged by a cam 32! carried by the slide 216. The cam 32| is shaped so that the strip P will be compressed by the finger 3 during the first portion of the downward stroke of the slide 216. Compression of the strip P takes place before it is engaged by the blade 218. By maintaining the strip P in compressed condition, the shearing of the strip by movement of a shear blade in the direction parallel to the longer cross sectional dimension of the strip is facilitated.

Clutch and clutch control The clutch C will now be described in detail with reference to Figs. 18, 19, 20 and 22. The hub of gear 5| provides a bearing sleeve330 to which the gear 5| is attached by a key 331 Shaft 52 and sleeve 330 are provided with mating recesses which it appears in Figs. 18 and 19 provide a round hole 332 for receiving a cross pin 333. Pin 333 is integral with an arm 334 urged by an helical coil spring 335 against astop shoulder 333 provided by a collar 33'! which is fastened to shaft 52 by key 338 (see Fig. 22). Spring 335 is attached at one end to the arm 334 and at the other end to a stud 339 provided by the collar 331. As shown in Fig. 18, the arm 334. when urged by the spring 335 against the stop 336, so locates the pin 333 that it connects together the shaft 52 and the sleeve 33B, thereby connecting the gear 5! with shaft 52. In Fig. 19'

the pin 333 is shown in such position that the gear 5i and its sleeve 330 are disconnected from shaft 52. Sleeve 330 and gear 5| are retained on the shaft 52 by a washer52a and a nut 52b.

tion as a result of the arm 334 striking a bar 340 which is slidable in a groove 34! provided by the pedestal 43. The bar 340 terminates at its lower end at a cam follower 342 engageable with a cam 343 connected with a sleeve 344 which terminates in a handle or knob 345 located in front of the machine (see Fig. 2). The sleeve 344 is journalled in bearings provided by the pedestal bracket 43 and it supports a shaft 350 to which a pin 35! secures a disc 352 provided with an arcuate slot 353 and receiving a pin 354 attached to the cam 343.

Referring to Figs. 4, 5 and 6, shaft 350 is supported by an extension 355 of bearing bracket 2|4. Shaft 242, which operates the lifter cams 2I5 and 2H5, drives a beveled gear 355 meshing with a beveled gear 351 pinned to shaft 353. As stated before, the shaft 2|2 is so geared to shaft 83 that the former makes one complete revolution for fifteen reciprocations of the crank shaft 52. It will be understood that the number of these reciprocations depends on the number of slots in the armature core, this number being equal to N (the number of core slots) plus one. The armature illustrated in Fig. 18 requires fourteen reciprocations of the crank shaft 52 to insert fourteen strips P in the fourteen armature slots and then one additional reciprocation is required in order that the last slot to receive a strip P will be indexed one additional increment to bring it into alignment with the blade 283 which partially breaks away the peripheral insulation of the core. Therefore, it is apparent that the shaft 350 must rotate once while the crank shafts 52 and 12 make reciprocations.

Fig. 18 shows the condition of the shaft and the disc 352 driven thereby toward the end of the cycle of operation of the machine. As the disc 352 rotates clockwise, it causes the pin 354 and the cam 343 to rotate clockwise. It will be seen that cam 343 is about to engage the follower 342 on the end of clutch throw-out bar 340. As the cam 343 rotates from the position shown in Fig. 18 to that shown in Fig. 19, the bar 343 is lifted so that it will engage the arm 334 of clutch pin 333 as shown in Fig. 19, thereby bringing the intermediate cros hatched portion of pin 333 (see (Fig. 19) in such position as to free the sleeve 330 from the shaft 52, whereupon the gear 5| may rotate while the cranks are at rest.

In order that the cranks 51 and 11 will be promptly brought to rest, the shaft 52 is keyed with a brake drum 360 engaged by brake shoes 36| supported on a pin 362 which i carried by bracket 352a attached adjustably to table 46 by a screw 332D urged toward the drum 360 by a spring 363 which surrounds a bolt 334 passing through ears of the shoes and receiving a nut 365 by which tension of the spring 363 may be Pin 333 is caused to be located in this posi- 75 adjusted in order to vary the application of braking pressure to the drum 363.

At the end of a cycle of operation of the machine, the pedal I is depressed to release the armature shaft S from the chuck I l l, the armature assembly operated upon is removed and incomplete armature assembly is inserted in its place. While the new assembly is being located in the sleeve by the blade 294 (Fig. 24), the handle 296 (Fig. 2) having been turned for this purpose, the pedal I30 is released to permit the chuck l H to grip the shaft S of this new as sembly. Then the machine is started again by rotating the knob 345 counterclockwise as viewed in Fig. 1 and clockwise as viewed in Fig. 19. It will be noted that the arcuate slot 353 in the disc 352 provides sufiicient clearance for the pin 354 so that the cam 343 may be manually turned out of engagement with the cam follower 342, whereupon the bar 340 returns to the position shown in Fig. 18 by gravity and by the action of a spring 310 which surrounds a rod 31I carried by lugs 312 integral with a cover plate 313 which includes the groove in which the bar 340 is slidable. The spring 310 is confined between the upper lug 312 and a lug 340a integral with the slide 340.

Fig. 2'1 shows diagrammatically the movements of certain operating parts and is based on one revolution of the cranks 51 and 11 from down position. Curve D'D represents movement of 1 blade 218 and curve EE represents movement of blade 288.

The curve D'D contains points A, B, C and D corresponding respectively to lines AA, BB, C and DD of Fig. 25. Point A on the curve and line A-A of Fig. 25 represent the uppermost position of the blade 218. Point B and line BB indicates where the blade 218 begins shearing the folded paper strips P. At point C of Fig. 2'1 and at line C-C of Fig. 25, the strip P begins to enter thec ore slot. At point D and at line DD, which represents the lowermost position of the blade 218, the strip P has been placed in the core slot.

From G to H on curve F-F the paper strips P are being folded and fed to a position adjacent the armature core.

During 14 of the 15 cycles of the machine the feed rolls drivingly engage the paper as indicated by line MM. Toward the end of the 14th cycle the feed rolls are relieved of driving engagement with the paper by raising the upper feed rolls as indicated by line L-J. During the first 90 of the first cycle the upper feed rolls are lowered as indicated by line J 'K. The 90 line represents where the machine comes to rest at the end of the 15th cycle.

Curve N'N represents operations of the armature indexing pawl I03. Between P and Q on curve N'N the armature is indexed. Between Q and N and between N and O the pawl I03 is retracted. Between 0 and P the pawl I03 is advanced before engaging the ratchet I05 (Fig. 8).

Curve R'R represents the action of the paper clamping finger 3 (Fig. 18). Between T and U the finger SM is fully retracted. Between U (corresponding to H on curve F'--F) and V (corresponding to B on curve D'D) the finger 3| I is advanced to clamp the strip P. Between V and R and between R and S the strips P are confined by the finger 3II while the blade 218 is operating to push the strips P into a core slot. The clamping pressure afforded by the finger 3II is not so great as to prevent this movement of the strips P. Between S and T, the finger 3 is being retracted.

While the embodiment of the present invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

What is claimed is as follows:

1. A machine for manufacturing dynamo armatures comprising a workholder for rotatively supporting a slotted armature core assembled with windings which retain in the core slots nonconducting linings of sheet insulating material which surrounds the core teeth; means for intermittently rotarily indexing the core by increments equal to the angular opening of the core slots; means operative during rotation of the core for intermittently feeding a folded body of insulating material longitudinally with respect to the core and of such thickness as to pass into the core slot between adjacent core teeth overlaid with sheet insulating material to a location in radial alignment with a core slot; two reciprocating blades movable radially into adjacent core slots, one blade operable to insert the body into a core slot, the other blade being. operable to press said body against the windings in the slot causing the folded body to spread laterally over the windings to seal the entrance of the slot and also to compress the strip of insulation overlying the core teeth against the core teeth to such extent as to weaken materially said strip insulation where it is bent around the edges of the core teeth in order to facilitate removal from slot lining portions those portions which overlie the peripheries of the core teeth; and means for moving said blades into the core slots while the core indexing means and the body feeding means are at rest.

2. A machine according to claim 1 and having a power drive and an automatic clutch throw out which cause the machine to stop after N and 1 reciprocations of the blades plus having means for causing the feeding means to cease after N reciprocations of the blades, N being equal to the number of coil slots.

3. A machine according to claim 1 in which the feeding means includes mechanically driven rolls engaging bodies, and having a power driven and an automatic clutch-throwout which causes the machine to stop after N +1 reciprocations of the blades, and having means for causing the rolls to become relieved of driving engagement with bodies after N reciprocations of the blades so that no body will be fed during (N+1) the reciprocation, N being equal to the number of core slots.

4. A machine for manufacturing dynamo armatures comprising a workholder for rotatively supporting a slotted armature core assembled with windings which retain in the core slot nonconducting linings of sheet insulating material which surrounds the core teeth; means for intermittently rotarily indexing the core by steps equal to the angular spacing of the core slots; means for supplying folded lengths of insulating material of such thickness as to pass into a core slot between adjacent core teeth overlaid with sheet insulating material; means for positioning a folded length in radial alignment with a core slot; a pairof reciprocating blades movable radially into adjacent core slots, one blade operable to insert the length into a core slot, the other blade being operable to press the length against the windings in the slot causing the strip to spread laterally over the winding to seal the throat and also to compress the strip of insulation overlying the core teeth to such extent as to weaken materially said strip insulation where it is bent around the edges of the core teeth in order to facilitate removal from slot lining portions those portions which overlie the peripheries of the core teeth; and means for moving the blades into the core slots while the core indexing means and the folded length positioning means are at rest.

LORA E. POOLE. E. R. FAUSSET, 

